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How can seismology help constrain the nature of plumes and upwellings? Barbara Romanowicz UC Berkeley CIDER’04-KITP
Possible seismological approaches Local tomography Converted phases/receiver functions Global tomography –elastic velocity, anisotropy, attenuation forward modelling of waveforms
Shen et al., 1999 ICELAND PLUME
Allen et al., 2002 Iceland
Shen et al., 1998
Li, Kind et al., 2004
Montelli et al., 2004
KH2000 Tokyo’98 SAW24B16 Montelli et al., 2004
Karason and van der Hilst, 2000
Long wavelength S velocity model SAW24B16 Mégnin and Romanowicz, 2000
Depth = 250 km Panning and Romanowicz, 2004 Radial Anisotropy
Open symbols:250km Filled symbols:300km diamonds: MAR circles: EPR Panning and Romanowicz, 2004 Correlation between strength of radial anisotropy and spreading rate
Mégnin and Romanowicz, 2000
Anelastic attenuation: QRLW8 Gung and Romanowicz, 2003
Q: Centered on Africa
AB CD “Pacific Superplume” Q -1 Hawaii Romanowicz and Gung, 2002
Romanowicz, 1994, EPSL Correlation of Q -1 with spreading rate EPR
Ekström and Dziewonski, 1998
Hawaii Under Pacific: transverse isotropy versus Q Anisotropy versus attenuation Central Pacific
Montagner and Tanimoto, 1991
MNST African “superplume” Elastic SAW24B16 Q -1
Panning and Romanowicz, 2004
Panning and Romanowicz,,2004 ISOTROPIC VELOCITY ANISOTROPY
Ni et al., 2002 Sharp boundary of the African Superplume
Forward modelling of fine scale structure
Toh et al. 2004
CSEM Synthetics Toh et al. 2004
Conclusions Combination of elastic, anelastic and anisotropic tomography at the global scale can help constrain large scale flow - in particular the morphology of upwellings Need a very large aperture array centered in the Pacific ocean !!
3D seismic imaging of the earth’s mantle Barbara Romanowicz Department of Earth and Planetary Science U.C. Berkeley.
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Landings by Species Group and Year. Revenue by Species Group.
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